By some estimates the productivity ratio, which represents the difference between the best performance and the worst, was 5:1 or lower during the early days of it.

在早期的IT日子中，评估的生产力的比率，即在最好的个体生产力和最差的之间的比值，最大可以达到5：1。

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Contrast ratio: a number ratio resembling 1:1 or 10, 000:1, which illustrates how much difference there is between the brightest whites and the darkest black colors the screen can display.

对比度：一个比值，如1：1或10,000：1，代表屏幕所能表现出的最亮白色和最深黑色之间的差值。

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There was obvious difference on leukocyte counting but no difference on lymphocyte apoptosis ratio between the two groups.

两组家兔相比，照射后白细胞计数差别明显，但淋巴细胞凋亡比例差异不显著。

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The difference between ratio is a reward every certain number of times somebody does something.

比率强化意思是,间隔一定比例才给予奖励。

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